Ever since 1998, at least one Dreamcast game has been released each year and 2011 is not an exception.
The first game which looks very interesting is “Sturmwind”. It's a 2D (with some 3D effects) side-scrolling shooter with amazing graphics. It looks like it could be an Xbox 360 game. I'm really looking forward to this game and it's supposed to be released November 11 this year. It supports PAL50, PAL60, NTSC and is VGA compatible. It also features 16 levels, more than 20 bosses and three difficulty levels. It's being published by RedspotGames.
Another game is “Gunlord” which is going to be release for both Dreamcast and Neo Geo. It's a 2D platformer, which I think the Dreamcast needs a lot more of, and looks like Castlevania and Contra mixed into one game. There's no gameplay video as of yet. The developer, NG:DEV.TEAM, has released a few screenshots and it looks very promising. It's expected to be released this year.
Check out the website below for screenshots and additional information: